Building Block



FIG. 1 is a perspective view of a building block showing my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a sectional view along line A-A of FIG. 6; and,

FIG. 9 is a sectional view along line B-B of FIG. 6.

CLAIM The ornamental design for a building block, as shown and described. 